Engine-indicator



D. G. R008.

ENGINE INDICATOR. APPLICATION HLED JULY 17, 1916.

1,349,346, Patented Aug. 10,1920.

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I Invew fiar: DeZzu-ar (HR/005 UNITED STATES PATENT OFFICE.

DELMAR G. ROOS, OF BRIDGEPORT, CONNECTICUT, ASSIGNOR, BY MESNE ASSIGN-MENTS, TO THE LOCOMOBILE COMPANY, OF

PORA'I'ION OF DELAWARE.

BRIDGEPORT, CONNECTICUT, A COR- ENGINE-INDICATOR.

Application filed July 17,

To all whom it may concern: 7

Be it known that I, DELMAR.G. Roos, a citizen of the United States, anda resident of Bridgeport, county of Fairfield, and State of Connecticut,have invented an Improvement in Engine-Indicators, of which thefollowing description, in connection with the accompanying drawings, isa specification, like characters on the drawings representing likeparts.

This invention relates to engine indicators, and is more particularlyconcerned with means for indicating a cylinder pressure at apredetermined point in the piston stroke, which point may be varied atwill, so that a study may be made of the pressure conditions at anygiven portion of the pis ton stroke, andvfrom such observations adiagram plotted from the data thus obtained, as distinguished frominstruments in the use of which an instantaneous diagram of the wholestroke is made.

My invention will be best understood by reference to the followingdescription, when taken in connection with the accompanying illustrationof one specific embodiment thereof, while its scope will be moreparticularly pointed out in the appended claims.

In the drawings:

Figure 1 is a front elevation of an engine indicating apparatusembodying my invention;

F Fig. 2 is a sectional view on line 2-2 of Fig. 3 is a sectional viewon line 3--3 of Fig. 2; and

Fig. 4 is a detail sectional View on line H of Fig. 1.

Referring to the drawings, and to the embodiment of my invention which Ihave selected for illustration, I have there shown, largely indiagrammatic and conventional fashion, an engine indicating apparatuscomprising suitable pressure responsive means, herein a pressure gage 1,which may be of any usual well known type adapted for the purpose, andpreferably equipped with a suitable shut-off valve 2, by means of whichit may be shut off from the source of pressure. A conduit 3 leads fromthe pressure gage to a'point where it ma be placed in communication witha cylin er 4 of an Specification of Letters Patent.

Patented Aug. 10, 1920.

1916. Serial No. 109,625.

engine 5 during a predetermined portion of the stroke of an enginepiston 6.

In the specific embodiment, a conduit 7 leads from a piston 'chamber 8,and communicates with a suitable engine-driven element 9, herein in theform of a species of rotating valve. In the present example, thisrotating valve is provided with an axial passage 10, at all times incommunication with the conduit 7 which'enters such passage at the outerend of the latter, and is provided with a suitable stuffing box 11 toprevent leakage. The rotary valve 9 is further provided with a radial'passage 12, communicating with the axial passage 10, and terminating atthe circumferential surface of the valve.

Encircling the valve 9 is a valve casing 13, the latter being providedwith a port 14 disposed in the same plane as the passage 12, whereby thelatter is caused to communicate with such port intermittently during therotation of the valve. The. port 14 at all times communicates with theconduit 3, by way of a suitable passage 15, the latter herein beingannular, and formed either in the valvecasing 13 or in the surroundinghousing 16, or partly in each. The valve casing 13 may be held againstaxial-movement in the housin 16 by suitable means,

herein rings 17 and 18, secured to the ends of the housing andoverlapping the ends of the valve casing as clearly shown in Big. 2.

The valve 9 may be operated in definitely timed relation with the enginepiston 6 by suitable gearing. herein comprising a sprocket wheel 19connected by a chain 20 to a sprocket wheel 21, the latter being securedto a usual crank-shaft 22 connected by a usual connecting rod 23 to thepiston 6 of the engine. The ratio of the gearing will naturally be suchthat the cycle of the valve 9 will correspond with the power stroke ofthe engines cycle, and the ratio can be changed from time to time bfisubstituting different sprocket wheels. y mounting the valve casing 13to turn in the housing 16, the point in the stroke at which pressure isutilized for operating the pressure-res -means herein comprisingdicating the particular point in the pistons stroke at which the readingis taken, such an index 28 cooperating with a graduated scale 29, thelength of such scale corresponding to the length of the piston stroke,and the scalebeing appropriately graduated in inches or other units ofmeasure; If, for example, it is desired to have a 6-inch stroke, and ifsuitable gearing be employed, the scale may be 6 inches long andgraduated into inches and fractions thereof, thus enabling the engineerto observethe pressure conditions obtaining in the cylinder at any givenpoint in the piston stroke, by simply turning the index 28 to theselected point'indicated by the scale. It is also evident that. insteadof changing the ratio of the gearing or in addition to such change ofratio, the graduated scale may be removed and a different onesubstituted.

Any suitable means may be provided to prevent accidental turningmovement of the valve casing 13, but one suitable and very 1 simpleexpedient is to provide the scale 29 with graduations 30 in the form ofshallow radial grooves (see Fig. 4c), to receive the index finger 28,the latter forthis purpose being resilient, so as to snap into thegroove and hold the valve casing definitely in the selected position ofadjustment.

By means of the described apparatus, the engineer is enabled to studythe pressure conditions at a predetermined point in the piston stroke,to the exclusion of the remainder' of the stroke, and take readings atany pointat will, after which a diagram may be plotted from 'thereadings thus secured, this method having marked advantages over thatheretofore employed in the taking ofan instantaneous record of theentire stroke in a single operation.

While I have herein shown and described one speclfic form or embodimentof my invention for illustrative purposes, and have disclosed anddiscussed in detail the construction and arrangement incidental to onespecific application thereof, it is to be understood that the inventionis limited neither to the mere details or relative arrangement of parts,nor to its specific embodiment herein shown, but that extensivedeviations from the illustrated form or embodiment of the invention maybe made,

without departing from the principles thereof.

Having thus described my invention, what I claim and desire by LettersPatent to secure is:

1. In an indicator for pressure fluid engines, the combination ofpressure-responsive means, and engine-driven means including a valvehaving a cycle of movementcorresponding in duration to the pistons powerstroke and means through which said valve establishes communicationbetween the engines cylinder and said pressure-responsive means during apredetermined portion only of the pistons power stroke and during apredetermined portion only of said cycle of movement of said valve.

2. In an indicator for pressure fluid engines, the combination ofpressure-responsive means, engine-driven means including a valve havinga cycle of movement corresponding in duration to the pistons powerstroke, means to cause said valve to establish communication between theengines' cylinder and said pressure-responsive means during apredetermined portion only of the pistons power stroke, and during apredetermined portion only of said cycle of movement of said valve, andmeans at will to determine the particular point in said valves cycle andin such power stroke at which such communication will be established.

3. In an indicator for pressure fluid engines, the combination ofpressure-responsive means, and valve means including two cooperatingvalve elements one of which is driven continuously during the powerstroke in definitely timed relation with the engine and the other ofwhich is adjustable with reference to the travel of the first, saidvalve means having provision to establish communication between theengines cylinder and said pressure-responsive means at a period in thepistons stroke, which period is determinedby such adjustment.

4. An instrument of the class described comprising, in combination, apressure-fluid supply conduit, pressure-responsive means, and means toplace said pressure-responsive means in communication with said supplyconduit, thesecond mentioned meanscomprising avalve and a valve casing,valve operating means for relatively moving said valve and valve casing,and means for varying the timing of said valve by moving said valvecasing. I

5. An instrument of. the class described comprising, in combination, apressure fluid supply conduit, pressure-responsive means, and means toplace said pressure-responsive means in communication with said supplyconduit, the second-mentioned means comprising a rotatable valve, valveoperating means, and rotatable means erating with said valve for ing ofsaid valve.

6. An instrument of the class described comprising, in combination, apressure fluid supply conduit, pressure-responsive means, and means toplace said pressure-responsive means in communication with said supplyconduit, the second-mentioned means comdirectly coopvarying thetimprising a rotatable valve having a periph eral port, valve operatingmeans to drive said valve continuously during the power stroke, androtatably adjustablemeans provided with a port with which saidperipheral port registers during a portion of the rotation of saidvalve. a

7. An instrument of the class described comprising, in combination, apressure fluid supply conduit, pressure-responsive means, and means toplace said pressure-responsive means in communication with said supplyconduit, the second-mentioned means comprising a rotatable valve havinga peripheral port, valve operating means to drive said valvecontinuously during the power stroke, rotatably adjustable meansprovidedwith a port with which said pe ripheral port registers during a portionof the rotation of said valve, and a housing inclosing said rotatablemeans and having a passage communicating at all times with thesecond-mentioned port and with said pressure-responsive means.

8. An instrument of the class described comprising, in combination, apressure-fluid supply conduit, pressure-responsive means, and means toplace said pressure-responsive means in communication with said supplyconduit, the second-mentioned means comprising a rotatable valve havinga peripheral port, valve operating means to drive said valvecontinuously during the power stroke, rotatable means provided with aport with which said peripheral port registers during a portion of therotation of said valve, and means for indicating the position of saidrotatable means with respect to its rotative movement.

9. An instrument of the class descrlbed comprlslng, in combination, apressure fiuld supply conduit 7, pressure responsive means 7 1, andmeans to p sive means in communication with said supply conduit, thesecondmentioned means comprisinga rotatable valve 9, having a peripheralport 12, valve operating means 19, 20, rotatable means 16 provided witha port 1 1 with which said peripheral port reglsace said pressurerespon-,

ters during a portion ofthe rotation of said 7 valve, and means 28, 29for indicating the position of said, rotatable means with respect to itsrotative movement.

In testimony whereof, I have signed my name to this specification. I

,DELMAR'G. R008.

